Biopigments from Monascus: strains selection, citrinin production and color stability
Biopigments from Monascus: strains selection, citrinin production and color stability
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DOI：
10.1590/s1516-89132005000800004
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发表时间：
2005-11-01
影响因子：
1
通讯作者：
Soccol, Carlos Ricardo
中科院分区：
文献类型：
--
作者：
Carvalho, Júlio Cesar de;Oishi, Bruno Oliva;Soccol, Carlos Ricardo
真菌属真菌是天然色素添加剂的一个有前途的来源。然而，在有效地将Monoclonal应用于食品之前，重要的是选择产生大量生物色素但很少或不产生桔霉素的菌株，桔霉素通常也由这些真菌产生。此外，应适当研究这些颜料的颜色稳定性。为了比较Monoclonal菌株在固体基质发酵（SSF）中的生物色素生产，将4种菌株（NRRL 1991、NRRL 2897、CCT 3802和LPB 31）在培养皿中在PDA上培养，并比较径向生长速度。此外，这些菌株在煮熟的米饭上培养，并比较它们产生生物色素和桔霉素的能力。结果表明，菌株LPB 31是SSF生产生物色素的最佳菌株，其提取液中的色素含量较高，桔霉素含量较低，是一株有前途的生物色素生产菌株。生物色素的热稳定性和pH稳定性试验表明，这些生物色素在低pH和高温下不稳定，但在接近中性的pH和非热加工食品中可以成功地使用。
Fungi form the genus Monascus are a promising source for natural color additives. However, before effectively applying Monascus to foods, it is important to select strains which produce large amounts of biopigments but little or no citrinin, a mycotoxin usually also produced by these fungi. Also, color stability of these pigments should be properly investigated. In order to compare Monascus strains for biopigment production in solid substrate fermentation (SSF), 4 strains (NRRL 1991, NRRL 2897, CCT 3802 and LPB 31) were cultivated over PDA in Petri dishes, and compared for radial growth velocity. Also, these strains were cultivated over cooked rice, and compared in relation to their capacity to produce biopigments and citrinin. The results showed that the strain LPB 31 is the best strain for biopigment production in SSF, giving both higher pigment concentration and lower citrinin concentration on the extracts, showing that it is a promising strain for production of this bioproduct. Biopigmentassays for heat and pH stability, show that these biopigments are unstable at low pH and high temperatures, but may be successfully used at near-neutrality pH's and in non-thermal processed foods.